I just tried the demo for Keyword: A Spider's Thread and immediately bought the game. It seems like a fairly linear "search the emails, find the passwords" kind of thing but there are some really neat ideas up front in the demo which I won't spoil. Demo took me about an hour according to Steam? Seemed like a lot less!
I just finished the game and have kind of mixed feelings.
Game time was 4-5 hours for me.
The first 2,5 to 3 hours (which probably include the demo, which I haven't played) were really, really great. The way you got information and hacked your way into the accounts was fun. Of course the "hackings" behave often more like puzzles than realistic hacking procedures - but for this kind of game it was fitting.
Than at some time in late game,
when you reveal some special information, suddenly you are thrown into a kind of "dream" sequence (without spoilering anything), which is really strange and doesn't fit the beginning of the game at all IMO.
At the end (besides some easy finishing puzzles), the game introduces a few action events/puzzles with time limits. Normally these wouldn't be a big problem, but the slightly janky controls and the huge area to search make these more annoying than necessary.
Very slight spoiler:
Even with the clock ticking, for the final puzzle you have to wait for quite some time, but than only have one or two seconds to react. If you fail, you have to repeat this puzzle with the waiting part again.
TDLR: Not a bad game. Starts great, but then shifts tonally to something different at the end. Ending action puzzles are slightly annoying.
If you are into deciphering clues, search E-Mails, texts and images for information and also sometimes like to think out of the box - this game might still be something for you.